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fmt/test/format-impl-test.cc

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// Formatting library for C++ - formatting library implementation tests
//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.
#include <algorithm>
#include <cstring>
// clang-format off
#include "test-assert.h"
// clang-format on
#include "fmt/format.h"
#include "gmock/gmock.h"
#include "util.h"
using fmt::detail::bigint;
using fmt::detail::fp;
using fmt::detail::max_value;
static_assert(!std::is_copy_constructible<bigint>::value, "");
static_assert(!std::is_copy_assignable<bigint>::value, "");
TEST(bigint_test, construct) {
EXPECT_EQ("", fmt::format("{}", bigint()));
EXPECT_EQ("42", fmt::format("{}", bigint(0x42)));
EXPECT_EQ("123456789abcedf0", fmt::format("{}", bigint(0x123456789abcedf0)));
}
TEST(bigint_test, compare) {
bigint n1(42);
bigint n2(42);
EXPECT_EQ(compare(n1, n2), 0);
n2 <<= 32;
EXPECT_LT(compare(n1, n2), 0);
bigint n3(43);
EXPECT_LT(compare(n1, n3), 0);
EXPECT_GT(compare(n3, n1), 0);
bigint n4(42 * 0x100000001);
EXPECT_LT(compare(n2, n4), 0);
EXPECT_GT(compare(n4, n2), 0);
}
TEST(bigint_test, add_compare) {
EXPECT_LT(
add_compare(bigint(0xffffffff), bigint(0xffffffff), bigint(1) <<= 64), 0);
EXPECT_LT(add_compare(bigint(1) <<= 32, bigint(1), bigint(1) <<= 96), 0);
EXPECT_GT(add_compare(bigint(1) <<= 32, bigint(0), bigint(0xffffffff)), 0);
EXPECT_GT(add_compare(bigint(0), bigint(1) <<= 32, bigint(0xffffffff)), 0);
EXPECT_GT(add_compare(bigint(42), bigint(1), bigint(42)), 0);
EXPECT_GT(add_compare(bigint(0xffffffff), bigint(1), bigint(0xffffffff)), 0);
EXPECT_LT(add_compare(bigint(10), bigint(10), bigint(22)), 0);
EXPECT_LT(add_compare(bigint(0x100000010), bigint(0x100000010),
bigint(0x300000010)),
0);
EXPECT_GT(add_compare(bigint(0x1ffffffff), bigint(0x100000002),
bigint(0x300000000)),
0);
EXPECT_EQ(add_compare(bigint(0x1ffffffff), bigint(0x100000002),
bigint(0x300000001)),
0);
EXPECT_LT(add_compare(bigint(0x1ffffffff), bigint(0x100000002),
bigint(0x300000002)),
0);
EXPECT_LT(add_compare(bigint(0x1ffffffff), bigint(0x100000002),
bigint(0x300000003)),
0);
}
TEST(bigint_test, shift_left) {
bigint n(0x42);
n <<= 0;
EXPECT_EQ("42", fmt::format("{}", n));
n <<= 1;
EXPECT_EQ("84", fmt::format("{}", n));
n <<= 25;
EXPECT_EQ("108000000", fmt::format("{}", n));
}
TEST(bigint_test, multiply) {
bigint n(0x42);
EXPECT_THROW(n *= 0, assertion_failure);
n *= 1;
EXPECT_EQ("42", fmt::format("{}", n));
n *= 2;
EXPECT_EQ("84", fmt::format("{}", n));
n *= 0x12345678;
EXPECT_EQ("962fc95e0", fmt::format("{}", n));
bigint bigmax(max_value<uint32_t>());
bigmax *= max_value<uint32_t>();
EXPECT_EQ("fffffffe00000001", fmt::format("{}", bigmax));
bigmax.assign(max_value<uint64_t>());
bigmax *= max_value<uint64_t>();
EXPECT_EQ("fffffffffffffffe0000000000000001", fmt::format("{}", bigmax));
}
TEST(bigint_test, accumulator) {
fmt::detail::accumulator acc;
EXPECT_EQ(acc.lower, 0);
EXPECT_EQ(acc.upper, 0);
acc.upper = 12;
acc.lower = 34;
EXPECT_EQ(static_cast<uint32_t>(acc), 34);
acc += 56;
EXPECT_EQ(acc.lower, 90);
acc += max_value<uint64_t>();
EXPECT_EQ(acc.upper, 13);
EXPECT_EQ(acc.lower, 89);
acc >>= 32;
EXPECT_EQ(acc.upper, 0);
EXPECT_EQ(acc.lower, 13 * 0x100000000);
}
TEST(bigint_test, square) {
bigint n0(0);
n0.square();
EXPECT_EQ("0", fmt::format("{}", n0));
bigint n1(0x100);
n1.square();
EXPECT_EQ("10000", fmt::format("{}", n1));
bigint n2(0xfffffffff);
n2.square();
EXPECT_EQ("ffffffffe000000001", fmt::format("{}", n2));
bigint n3(max_value<uint64_t>());
n3.square();
EXPECT_EQ("fffffffffffffffe0000000000000001", fmt::format("{}", n3));
bigint n4;
n4.assign_pow10(10);
EXPECT_EQ("2540be400", fmt::format("{}", n4));
}
TEST(bigint_test, divmod_assign_zero_divisor) {
bigint zero(0);
EXPECT_THROW(bigint(0).divmod_assign(zero), assertion_failure);
EXPECT_THROW(bigint(42).divmod_assign(zero), assertion_failure);
}
TEST(bigint_test, divmod_assign_self) {
bigint n(100);
EXPECT_THROW(n.divmod_assign(n), assertion_failure);
}
TEST(bigint_test, divmod_assign_unaligned) {
// (42 << 340) / pow(10, 100):
bigint n1(42);
n1 <<= 340;
bigint n2;
n2.assign_pow10(100);
int result = n1.divmod_assign(n2);
EXPECT_EQ(result, 9406);
EXPECT_EQ("10f8353019583bfc29ffc8f564e1b9f9d819dbb4cf783e4507eca1539220p96",
fmt::format("{}", n1));
}
TEST(bigint_test, divmod_assign) {
// 100 / 10:
bigint n1(100);
int result = n1.divmod_assign(bigint(10));
EXPECT_EQ(result, 10);
EXPECT_EQ("0", fmt::format("{}", n1));
// pow(10, 100) / (42 << 320):
n1.assign_pow10(100);
result = n1.divmod_assign(bigint(42) <<= 320);
EXPECT_EQ(result, 111);
EXPECT_EQ("13ad2594c37ceb0b2784c4ce0bf38ace408e211a7caab24308a82e8f10p96",
fmt::format("{}", n1));
// 42 / 100:
bigint n2(42);
n1.assign_pow10(2);
result = n2.divmod_assign(n1);
EXPECT_EQ(result, 0);
EXPECT_EQ("2a", fmt::format("{}", n2));
}
template <bool is_iec559> void run_double_tests() {
fmt::print("warning: double is not IEC559, skipping FP tests\n");
}
template <> void run_double_tests<true>() {
// Construct from double.
EXPECT_EQ(fp(1.23), fp(0x13ae147ae147aeu, -52));
}
TEST(fp_test, double_tests) {
run_double_tests<std::numeric_limits<double>::is_iec559>();
}
TEST(fp_test, normalize) {
const auto v = fp(0xbeef, 42);
auto normalized = normalize(v);
EXPECT_EQ(0xbeef000000000000, normalized.f);
EXPECT_EQ(-6, normalized.e);
}
TEST(fp_test, multiply) {
auto v = fp(123ULL << 32, 4) * fp(56ULL << 32, 7);
EXPECT_EQ(v.f, 123u * 56u);
EXPECT_EQ(v.e, 4 + 7 + 64);
v = fp(123ULL << 32, 4) * fp(567ULL << 31, 8);
EXPECT_EQ(v.f, (123 * 567 + 1u) / 2);
EXPECT_EQ(v.e, 4 + 8 + 64);
}
TEST(fp_test, get_cached_power) {
using limits = std::numeric_limits<double>;
for (auto exp = limits::min_exponent; exp <= limits::max_exponent; ++exp) {
int dec_exp = 0;
auto fp = fmt::detail::get_cached_power(exp, dec_exp);
bigint exact, cache(fp.f);
if (dec_exp >= 0) {
exact.assign_pow10(dec_exp);
if (fp.e <= 0)
exact <<= -fp.e;
else
cache <<= fp.e;
exact.align(cache);
cache.align(exact);
auto exact_str = fmt::format("{}", exact);
auto cache_str = fmt::format("{}", cache);
EXPECT_EQ(exact_str.size(), cache_str.size());
EXPECT_EQ(exact_str.substr(0, 15), cache_str.substr(0, 15));
int diff = cache_str[15] - exact_str[15];
if (diff == 1)
EXPECT_GT(exact_str[16], '8');
else
EXPECT_EQ(diff, 0);
} else {
cache.assign_pow10(-dec_exp);
cache *= fp.f + 1; // Inexact check.
exact.assign(1);
exact <<= -fp.e;
exact.align(cache);
auto exact_str = fmt::format("{}", exact);
auto cache_str = fmt::format("{}", cache);
EXPECT_EQ(exact_str.size(), cache_str.size());
EXPECT_EQ(exact_str.substr(0, 16), cache_str.substr(0, 16));
}
}
}
TEST(fp_test, dragonbox_max_k) {
using fmt::detail::dragonbox::floor_log10_pow2;
using float_info = fmt::detail::dragonbox::float_info<float>;
EXPECT_EQ(fmt::detail::const_check(float_info::max_k),
float_info::kappa - floor_log10_pow2(float_info::min_exponent -
float_info::significand_bits));
using double_info = fmt::detail::dragonbox::float_info<double>;
EXPECT_EQ(
fmt::detail::const_check(double_info::max_k),
double_info::kappa - floor_log10_pow2(double_info::min_exponent -
double_info::significand_bits));
}
TEST(fp_test, get_round_direction) {
using fmt::detail::get_round_direction;
using fmt::detail::round_direction;
EXPECT_EQ(round_direction::down, get_round_direction(100, 50, 0));
EXPECT_EQ(round_direction::up, get_round_direction(100, 51, 0));
EXPECT_EQ(round_direction::down, get_round_direction(100, 40, 10));
EXPECT_EQ(round_direction::up, get_round_direction(100, 60, 10));
for (size_t i = 41; i < 60; ++i)
EXPECT_EQ(round_direction::unknown, get_round_direction(100, i, 10));
uint64_t max = max_value<uint64_t>();
EXPECT_THROW(get_round_direction(100, 100, 0), assertion_failure);
EXPECT_THROW(get_round_direction(100, 0, 100), assertion_failure);
EXPECT_THROW(get_round_direction(100, 0, 50), assertion_failure);
// Check that remainder + error doesn't overflow.
EXPECT_EQ(round_direction::up, get_round_direction(max, max - 1, 2));
// Check that 2 * (remainder + error) doesn't overflow.
EXPECT_EQ(round_direction::unknown,
get_round_direction(max, max / 2 + 1, max / 2));
// Check that remainder - error doesn't overflow.
EXPECT_EQ(round_direction::unknown, get_round_direction(100, 40, 41));
// Check that 2 * (remainder - error) doesn't overflow.
EXPECT_EQ(round_direction::up, get_round_direction(max, max - 1, 1));
}
TEST(fp_test, fixed_handler) {
struct handler : fmt::detail::fixed_handler {
char buffer[10];
handler(int prec = 0) : fmt::detail::fixed_handler() {
buf = buffer;
precision = prec;
}
};
int exp = 0;
handler().on_digit('0', 100, 99, 0, exp, false);
EXPECT_THROW(handler().on_digit('0', 100, 100, 0, exp, false),
assertion_failure);
namespace digits = fmt::detail::digits;
EXPECT_EQ(handler(1).on_digit('0', 100, 10, 10, exp, false), digits::error);
// Check that divisor - error doesn't overflow.
EXPECT_EQ(handler(1).on_digit('0', 100, 10, 101, exp, false), digits::error);
// Check that 2 * error doesn't overflow.
uint64_t max = max_value<uint64_t>();
EXPECT_EQ(handler(1).on_digit('0', max, 10, max - 1, exp, false),
digits::error);
}
TEST(fp_test, grisu_format_compiles_with_on_ieee_double) {
fmt::memory_buffer buf;
format_float(0.42, -1, fmt::detail::float_specs(), buf);
}
TEST(format_impl_test, format_error_code) {
std::string msg = "error 42", sep = ": ";
{
fmt::memory_buffer buffer;
format_to(fmt::appender(buffer), "garbage");
fmt::detail::format_error_code(buffer, 42, "test");
EXPECT_EQ("test: " + msg, to_string(buffer));
}
{
fmt::memory_buffer buffer;
auto prefix =
std::string(fmt::inline_buffer_size - msg.size() - sep.size() + 1, 'x');
fmt::detail::format_error_code(buffer, 42, prefix);
EXPECT_EQ(msg, to_string(buffer));
}
int codes[] = {42, -1};
for (size_t i = 0, n = sizeof(codes) / sizeof(*codes); i < n; ++i) {
// Test maximum buffer size.
msg = fmt::format("error {}", codes[i]);
fmt::memory_buffer buffer;
auto prefix =
std::string(fmt::inline_buffer_size - msg.size() - sep.size(), 'x');
fmt::detail::format_error_code(buffer, codes[i], prefix);
EXPECT_EQ(prefix + sep + msg, to_string(buffer));
size_t size = fmt::inline_buffer_size;
EXPECT_EQ(size, buffer.size());
buffer.resize(0);
// Test with a message that doesn't fit into the buffer.
prefix += 'x';
fmt::detail::format_error_code(buffer, codes[i], prefix);
EXPECT_EQ(msg, to_string(buffer));
}
}
TEST(format_impl_test, compute_width) {
EXPECT_EQ(4,
fmt::detail::compute_width(
fmt::basic_string_view<fmt::detail::char8_type>(
reinterpret_cast<const fmt::detail::char8_type*>("ёжик"))));
}
// Tests fmt::detail::count_digits for integer type Int.
template <typename Int> void test_count_digits() {
for (Int i = 0; i < 10; ++i) EXPECT_EQ(1u, fmt::detail::count_digits(i));
for (Int i = 1, n = 1, end = max_value<Int>() / 10; n <= end; ++i) {
n *= 10;
EXPECT_EQ(i, fmt::detail::count_digits(n - 1));
EXPECT_EQ(i + 1, fmt::detail::count_digits(n));
}
}
TEST(format_impl_test, count_digits) {
test_count_digits<uint32_t>();
test_count_digits<uint64_t>();
}
TEST(format_impl_test, write_fallback_uintptr) {
std::string s;
fmt::detail::write_ptr<char>(
std::back_inserter(s),
fmt::detail::fallback_uintptr(reinterpret_cast<void*>(0xface)), nullptr);
EXPECT_EQ(s, "0xface");
}
#ifdef _WIN32
# include <windows.h>
#endif
#ifdef _WIN32
TEST(format_impl_test, write_console_signature) {
decltype(WriteConsoleW)* p = fmt::detail::WriteConsoleW;
(void)p;
}
#endif
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